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Type Alias Complete<T>

Complete: {
    [P in keyof Required<T>]: Pick<T, P> extends Required<Pick<T, P>>
        ? T[P]
        : T[P] | undefined
}

Makes optional keys required and add the the undefined type.

interface Test {
 foo: number;
 bar?: number;
 baz: number | undefined;
}

Complete<Test> {
 foo: number;
 bar: number | undefined;
 baz: number | undefined;
}

See https://medium.com/terria/typescript-transforming-optional-properties-to-required-properties-that-may-be-undefined-7482cb4e1585

Type Parameters

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